lstelie

This plugin is devoted to weblogs several years old. Visitors comming through search engines can land on a post that is several years old. 
Old posts were very likely great by the time they were poublished, but can be out of date or even wrong by the time they are read several years later. 
As a lot of people don’t read the post date, this plug in alert them that the post is old. 
wp-oldpost is a good complement to plugins like “related post”, “archives” and so on. 
In its current form the plugin is very rough, no admin, fix periods (one year/more than 6 months)…

WP OldPost

Visitors to your site are noticed if the post is old, and are invited to use either archives or the search function.

rpetersen29

This plugin makes it easy to display a simple announcement banner or bar at the top of your website. You can easily customize the color of the links, text, and background of the bar from within the settings. You can also customize to your heart’s desire by adding your own custom CSS. There’s also a fancy preview section within the settings so you can see your changes before you save them.
<h4>Now with multi-banner support</h4>
With Pro features you can display up to 5 separate banners on your site. Banners can be shown simultaneously or plan weeks of banners by showing them consecutively.

Simple Banner – Easily add multiple Banners/Bars/Notifications/Announcements to the top or bottom of your website

The banners created are embedded within the html of the page, so if you enter your html correctly they will be tab-navigable and placed nicely in the content flow.

Very easy to use, instructions were clear, did what my client needed with no extra bells & whistles. 

good solution for simple accessible banner

Display a simple banner/bar at the top or bottom of your website. Now with multi-banner support.

WP OldPost vs Simple Banner – Easily add multiple Banners/Bars/Notifications/Announcements to the top or bottom of your website